| Literature DB >> 28507332 |
Lorenzo De Santis1, Carlos Antón1, Bogdan Reznychenko2,3, Niccolo Somaschi1, Guillaume Coppola1, Jean Senellart4, Carmen Gómez1, Aristide Lemaître1, Isabelle Sagnes1, Andrew G White5, Loïc Lanco1,6, Alexia Auffèves2,3, Pascale Senellart1.
Abstract
A strong limitation of linear optical quantum computing is the probabilistic operation of two-quantum-bit gates based on the coalescence of indistinguishable photons. A route to deterministic operation is to exploit the single-photon nonlinearity of an atomic transition. Through engineering of the atom-photon interaction, phase shifters, photon filters and photon-photon gates have been demonstrated with natural atoms. Proofs of concept have been reported with semiconductor quantum dots, yet limited by inefficient atom-photon interfaces and dephasing. Here, we report a highly efficient single-photon filter based on a large optical nonlinearity at the single-photon level, in a near-optimal quantum-dot cavity interface. When probed with coherent light wavepackets, the device shows a record nonlinearity threshold around 0.3 ± 0.1 incident photons. We demonstrate that 80% of the directly reflected light intensity consists of a single-photon Fock state and that the two- and three-photon components are strongly suppressed compared with the single-photon one.Year: 2017 PMID： 28507332 DOI： 10.1038/nnano.2017.85
Source DB: PubMed Journal: Nat Nanotechnol ISSN： 1748-3387 Impact factor: 39.213